COVER-PUMP 4415567 - Caterpillar

Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact the skin.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.Dispose of all fluids according to local regulations and mandates.
Operate the machine for a few minutes to warm the hydraulic system oil.
Park the machine on level ground. Engage the parking brake and stop the engine.
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Remove oil filler cap (1) slowly to relieve any remaining pressure.
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Remove cover (2).
Illustration 3 g06079693Note: Hand tighten the NPT pipe nipple. Do not use tools.
Remove hydraulic tank drain plug (3). Install a 1 in NPT pipe nipple, 88 mm (3.50 inch) long, in the bottom of the tank, to open the internal drain valve. Drain the oil into a suitable container.
Remove the pipe nipple. Clean the drain plug and install the drain plug.
Remove the strainer from the hydraulic oil filler tube.
Wash the oil filler cap and the strainer in clean, nonflammable solvent. Allow the oil filler cap and the strainer to dry.
Inspect the oil filler cap gasket. Use a new gasket if the used gasket is damaged. Install the strainer in the filler tube.
Fill the hydraulic tank with clean oil.Reference: For information on lubricants and refill capacities, refer to the Operation and Maintenance Manual, "Lubricant Viscosities and Refill Capacities" for the machine that is being serviced.
Install hydraulic filler cap (1)
Start the engine and run the engine at low idle. Check for leaks.
Stop the engine.
If necessary, tighten any loose clamps or any loose connections. Replace any damaged hoses.
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Install cover (2).
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Maintain the hydraulic oil level above the "ADD COLD" mark in sight gauge (4) . For machines equipped with a dump body check the oil level with the body fully lowered. For machines equipped with an ejector body check the oil level with the ejector plate fully retracted and the tailgate fully raised.
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Add oil if necessary, remove hydraulic tank filler cap (1).